Method of making sintered body, and powder compact

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United States of America

PATENT NO 12076791
SERIAL NO

17594124

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Abstract

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A method of making a sintered body includes a step of preparing raw material powder containing powder of inorganic material, a step of producing a powder compact having a high-density portion with a relative density of 93% or more and a low-density portion with a relative density of less than 93% by compressing the raw material powder injected into a mold, a step of producing a machined compacted part by machining at least the high-density portion of the powder compact, and a step of sintering the machined compacted part to make a sintered body, wherein a perimeter shape of a cavity constituted by the mold in a cross-section perpendicular to an axial direction of the mold is such than a maximum stress applied to an inner perimeter surface of the mold during a compacting process using the mold is less than or equal to 2.6 times an imaginary maximum stress that is applied to an inner perimeter surface of an imaginary mold during a compacting process using the imaginary mold, the imaginary mold having an imaginary cavity that has a same area as the cavity and that has a circular perimeter shape.

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Patent Owner(s)

Patent OwnerAddress
SUMITOMO ELECTRIC INDUSTRIES LTDOSAKA-SHI OSAKA 541-0041
SUMITOMO ELECTRIC SINTERED ALLOY LTD2901 NARIWA NARIWA-CHO TAKAHASHI-SHI OKAYAMA 7160192 ?7160192

International Classification(s)

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Inventor(s)

Inventor Name Address # of filed Patents Total Citations
Egashira, Shigeki Osaka, JP 12 5
Ishimine, Tomoyuki Osaka, JP 20 41
Noda, Munehiro Osaka, JP 16 289
Shimauchi, Kazunari Osaka, JP 13 6
Tashiro, Takayuki Osaka, JP 13 132

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